Andrey A. Chernov
2f5ef51de2
Park & Miller PRNG can be safely initialized with any value but 0 and stuck
...
at 0 as designed. Its BSD adaptation tries to fight it by mapping 0 to
2147483647 after calculation, but this method not works since 2147483647
seed returns to 0 again on the next interation. Instead of after calculation
mapping, map 0 to another value _before_ calculation, so it never stucks.
2003-02-03 10:22:12 +00:00
Andrey A. Chernov
62c4150e1e
For some combinations of variable sizes and RAND_MAX value rand_r()
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may store less amount bits for seed, than available. Fix it.
2003-02-02 14:27:51 +00:00
Tim J. Robbins
2b6839cf10
Add missing #include "namespace.h".
2003-01-03 23:38:21 +00:00
David E. O'Brien
333fc21e3c
Fix the style of the SCM ID's.
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I believe have made all of libc .c's as consistent as possible.
2002-03-22 21:53:29 +00:00
Mark Murray
724641c6f4
Add a long-overdue nail to the deprecated /dev/urandom interface
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by asking some things that need unpredictable numbers to read
/dev/random instead.
2001-10-30 21:26:50 +00:00
Dima Dorfman
a7d81577d6
urandom(4) -> random(4) in comments.
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PR: 27858
Submitted by: Yoshihiro Koya <Yoshihiro.Koya@math.yokohama-cu.ac.jp>
Reviewed by: md5(1)
Approved by: markm
2001-06-07 02:32:18 +00:00
Andrey A. Chernov
4890ae810e
Add #include "un-namespace.h"
2001-04-23 10:38:26 +00:00
Andrey A. Chernov
848422bb7d
srand*dev() fallback code: change ^getpid() to ^(getpid() << 16) to allow
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change of high word part too to produce more interesting seed distribution.
2001-04-23 10:14:28 +00:00
Andrey A. Chernov
7708205cb7
Add sranddev() since srand() is not vary much with seed, typical time
2001-04-23 02:29:10 +00:00
Andrey A. Chernov
cbcf73f998
Use formula with better random distribution for rand()
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Even better formula from random() could not be intetgrated because rand_r()
supposed to store its state in the single variable (but table needed for
random() algorithm integration).
2001-02-27 14:42:19 +00:00
Wes Peters
b7edcd43b5
Added Posix rand_r function.
1999-05-24 23:30:14 +00:00
Rodney W. Grimes
58f0484fa2
BSD 4.4 Lite Lib Sources
1994-05-27 05:00:24 +00:00
